Speed-reducing gear



L. G. E. BUEHLER.

SPEH) REDUCING GEAR. aPPucAnon HLED any n. ma.

Patented Nov. 4, 1919.

2 SHEETSSHEET l L. G. E. BUEHLER. SPEED REDUCNG GEAR, APPUCATIION Hum MY f Patented Nov. 4, 1919.

2 SHEETS'SHEET 2.

LOUIS G. E. BUEHLEB, 0F CHIQAGO, ILLINOIS.

SPEED-REDUCING GEAR.

Specification of Letters Patent.

Patented 'Nov. 4, 1919.

Application filed May 17, 1918. Serial No. 285,100.

7 '0 oil whom it may err/warn:

lie it known that I, Louis (i. E. llunnnnn, citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful lm 'irovements in Speed-Reducing Gears; and 1 do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to Whidh it appertuins to make and use the some. I

This invention has for its object to pro vide curtain new :iml useful improvements in spmdo'eclucing gears, and has for its particular object lo overcome certain dilfi culties as hereinafter explained.

In JPPHll-T'Pllllf'lllfl ronrs its a. general rule ho high spr-wi llllll low p ed shafts are dis posed in axial nlinenwnt and certain rotating' parts of the mechanism are rotatably mounted on one or --ther of said shafts and rotate relatively thereto during the rotation of the said hafts. As a general rule these reducing gears are mounted in housings into which the'low speed shnft extends for a. considerable length and this results fret uently in causing, said shaft to be flexed lzvy the strains imposed thereon and as a result of par-ts of the mechanism being rotntably sup ported upon the projecting end portion thereof. As a rule the gear sets become very ho (luring rotation and unless competently lubiicnted. are apt to bind upon each other; this being particularly true when the friction .hccolnes intense at certain points by flexing of the shaft whereby certain of the gears are thrown more or less out of proper position. In some instances it has been attem ted to prevent flexing of the low-speed sha. t by promoting the end of the high speed shaft into the opposed end of the low speed shaft, and this arrangement has been a. source of trouble because ofthe difiiculty of properly. lubricating this bearing. One o'b ect of my invention is to overcome these difficulties.

A further ob'ect of the invention is to rovide a spec -reducing gear which may lie easily and quickly assembled and disassembled for urposes of ins action and repair, and w ioh further a ords easy and eflicient means for effecting speed reduction of any desired ratio by adding certain ear sets Where the speed reduction is desire to be increased to a. material extent from an approximately usual standard.

Another object of the invention is to provide a speed-reducing gear in which certain of the ents constitute an integral part of or are c osely associateh and in eontant with the peripheral well of the casing or housing, and in which said housing may no water jacketed for maintaining said ar-S oool whereb the efliciencyof the deviceis conslderab y increased.

Further objects of peer from the f llowing 5 ecifieation.

In the aeeompa nyi (ii-swings I have illustrated the preferret embodiment of the invention for effecting a, speed reduction in a ratio approximating 25 to 1. In said 1 riiwings:

Figure --lis a central h'lngitullinlll sec tion of n speed-reducing gear (ZOHSIU'lHlQil in accordance with the invention.

Fig. 2- is a detail transverse section o. the same on the line 22 of'Fig. -1.

Fig. -3 is a fragmentary perspective view of two op osed genr-carryinginelnhers disposed within the gem-nosing.

Fig. is a. fragmentary, perspective" view of One of said members.

Referring inow to said drawings; 1 inclioatesa housing-for a, speedreducing; gear which coniprises tyvo end pletes" hetween which the peripheral or eireurnlerentinl wall (the latter being preferable) is securelyhelll by means of set-screws. The plate 2 is integral with a. sleeve bearing for the high speed shaft 3 and includes a )ortion 4 ex lending or projectin from t e inner face of said plate. At t e inner end of said shaft 3 1s a spur pinion 5. This meshes with a, plurality of idiots L6, "preferehly .thrl',-,e, equally spaced from each other which 7 the; shafts ,7- which are mounted at their ends inpp 08811 are rotatably mOUIL ed upon disks 8 and 9 respectively. -.;The disk; 9, 8.

hu b portion which; is; rotntebile np nthe pen tion 4 of the beating for-the .sheft B and- 1s igidly s ured to thesd s'kflwhy meensfif projections 10 extending from one fHQQrOf one of said disks to the opposed face. of the other thereof, andin which, bo lts assing through openings in the last mun. plate,- have threaded engagement. The. idiots are thus carried {in a. rotp.-teble.ifra ne. .Soid idlers also mesh. withqeng internel gearlO which pre ferably; is fitted into the circumferential wnllandiis fiuitahly' keyed thereto to prevent rotation thereof- .Thus as the shaft 3 rotates the idlers will .rotetep'bout diskfth'e snore 1 their own axes at the same time that the travel about the axis of the shaft 3 whic is coincident with the axis of the internal gear 10'.

In the hub of the disk 9 there is keyed the shank of a spur inion 11 which meshes with idlers 12 carried by the stud shafts 13 of a disk 14 which is keyed to the low speed shaft 15. The said idlers mesh with an internal gear 16, similar to the internal gear 10', but of somewhat larier pitch diameter. The low speed shaft 15 as two annularly reduced portions 17 and 18 respectively, wliich'prol'ect into the housing an the former of wli ch anaesthesia: 4 and the latter of which (bein'g' the smallerg rotates within the spur inion 1e audit 5 wk. It will, of (puma understood that suitable bronze bushinps we used wherever required, and that in p ace of the ordinary bearings herein shown, roller bearings may be used. The shaft 15 is journaled in a relatively long 19 integral Wi 'h the end plate 2 bearin of the ousing.

, In the instance illustrated the ear ratio for each set of idlers and interna cars is substantially 5 to,1, that is to say, or each five revolutions made by the high speed shaft, the frame carrying the first set of idlers will make five revolutions as will also the spur 1pinion II. For each five revolutions of t e 5 ur pinion ll the disk Hand low speed she t 15'w l1'1nake oncr'eyolution, the gear ratio be'in 'thus 25 to '1 between the igh speed ow'speed shafts. This ratio ma of course be varied as desired by" val-yin the relative pitch diameters of the severe s ur pinions and internal gears employed. f, for example, the speed reduction shoulcl'be desired to be in the ratio of 100 to 1 then the hub of the disk 14 would be rotatable on the low speed shaft and the same wouldcarry another s ur pinion meshing with another set of id ers, and the latter would mesh with another of the internal gears seen as the gear-101;; The last setof Idlers would be mounted on stud shafts of a disk" similar to *the ffdisk' 114 keyed to 'the low shaft, if"the'fleiet-nazmed added spur a internal r fWe're made in themed of \II rbiolutiflof the" inion' toassetareeesutnestrtaeua-mes was 4 tease "oiifi'aitio betweentuenigha W spee {shafts would he ;10 o :to 1. Obi ouslgi his radio cou'ltl be still further'riiultiplie as desired by furflier; additions of s ts in" the manner degscribed.- l

1 rt will-be fipted that; wneneverdesired the; sets ma beeailyitaken a art'and ref assembled byinerely' r moving't eend plate 2 ofthe housing and withdrawing one ear set after the other from the latter incl'u' mg, of'eourse, the int-amalgam; Any repairs necessary may the?! be eflectedand the adapted to all purposes of t :housing parts uickly and easily re-usscmbled without di culty.

The arran rement is very advantageous by reason of tie fact that the second spur pinion 11 is hold absolutely rigidly in axial alineinent with the hi h speed shaft and by reason of the pro ection of the inner end of the low-speed shaft into the hollow spur inion 11, said low-speed shaft is prevente from being flexed by the strains imposed thereon by the gear sets rotatably mounted thereon, where additional gear sets are employed. Furthermore, there is comparatively little relative s eed rotation between the low-speed sha t and the lastnamed spur pinion for the reason that both of the same will rotate in the same direction.

of idlers in roller bearings as will be ob vi'ous, though roller bearings may be used throughout 1f desired.

My said internal gear has been found to be veryeflicient in ractice and relatively economical and, noise ess.

Obviously the construction may be varied to some extentfrom the exact details shown in the accompanying drawin but all sue-h variations are included wl'sl ll'l the scope of the appended claims.

The device is suitable for many different purposes as for example, hoists or elevators, cranes and for direct transmission from hi'h speed electric motors to low speed lat ice and similar machiner and may be his general natare. I claim as my invention: F

Lf-A speed-reducing gear comprising-a aving a bearingat one end ro jecting; into the same, a hi h 'spe'ed s aft mam l otherfendefthe housin andprojectm the latter; a low-speed s a-ftjounnaled t ein, a spur pinion at the "inner end of the high-speed shaft, a air of disks journaled respectively on-said rat-named bearin and on the-inner end of the lowspeed s aft,- means rigidly "connecting said" dislis with The housing is also adapted to contain a ed=in 'said bearin ,a 'aring'in the rotates, and earn? between said disks and high-speed shaft, a pair of disks, a hollow the low-speed sha t. spurinion rigid and concentric with one 2. A speed-reducing gear comprising a of said disks and receivin the inner end of housing having a bearing at one end rothe low speed shaft, a dis keyed to the latjecting into same, a high-speed s aft ter, a plurality of stud shafts on said disk, a journaled in said bearing, a bearing in the second internal gear rigid with the housing, other end of the housin and projecting into and idlers on sald stud-shafts meshing with the latter, a low-speeds aft journaled theresaid last-named internal gear and pinion.

in, a spur pinion at the inner end of the 5. A s eed-reducing gear comprising a high-speed shaft, a pair of disks, one of housing aving a hearing at one end prowhich is journaled on said first-named bearjecting into the same, a hi h-speecl s aft ing, and the other of which is mounted on ournaled in said bearing, a caring in the the low-speed shaft, means rigidly connectother end of the housin and projectln into ing said disks with each other, a plurality the latter, a low-speed s aft journaled t ereof shafts spanning the space between said in, a spur pinion at the inner end of the disks, an internal gear rigidly mounted in high-speed shaft, a air of-disks journaled the housing around said disks. respectively on said rst-named bearing and 3. A speed-reducing gear comprising a on the inner end of the low-speed shaft,-

housing having a hearing at one'end romeans rigidly connecting said disks with jecting into the same, a hi h-speed s aft each other, a plurality of shafts spanning journaled in said bearing, a caring in the the space between said disks, an internal other end of the housin and projecting into gear rigidly mounted in the housing around the latter, a low-speed s aft journaled theresaid disks, and in contact with the periphin, a spur pinion at the inner end of the eral wall thereof, a plurality of idlers car high-speed shaft, a pair of disks, one of ried on said last-named shaft and meshin which is journalden saidfirst-namedbearwith said pinion and internal gear for e ings, means rigidly connectin saiddisks'with fecting rotation of said disks as said higheach other, a plurality of s afts sparmin speed shaft rotates, and gearing between the space between said disks, an interna said disks and the low-speed shaft.

gear rigidly mounted in the housing around 6. A speed reducing gear comprising a said disks, :1, plurafllitgt of idlers. carried on casing having axially alined hearings in lts s a s said last-named and meshin with opposite end walls, a high speed shaft joursaid inion and internal gear for e ecting naled in one of said bearings, a low speed rotation of said disks as said high-speed shaft journaled in the other of said bearings, shaft rotates, and operative connection bea gear element rigid with the casing and tween the other of said disks and said lowconcentric with said bearings, a pinion ri id speed shaft whereby the inner end of the with the high speed shaft, a plurality ofi 1e latter is supported by and the shaft actuated gears meshlng with said gear and said pinby said disks. ion, a rotatab e carrier for said gears opera- {1, A s iced-reducing gear comprising a tively associated with the low speed shaft to housing aving a hearing at one end prodrive the same, and a bearing element for jecting into the same, a high-speed s aft one end of said gear carrier rigid with the journaled in said bearing, a bearing in the casing and concentric with and disposed adother end of the housin and projecting into jacent the bearing for the high speed shaft. the latter, a low-speed s aft journaled therein, a spur pinion at the inner end of the LOUIS G. E. BUEHLER: 

